Add `task-list-item` class to task list items #1073

Job	Run time
build_wasm (nightly)	55s
build_lib_test (nightly)	52s
build_wasm (beta)	51s
clippy_format	1m 40s
build_lib_test (beta)	1m 14s
build_wasm (stable)	42s
build_bin_spec (nightly)	1m 5s
build_wasm ($MSRV)	2m 1s
build_lib_test (stable)	1m 12s
build_bin_spec (beta)	1m 13s
lockfile	1m 2s
build_lib_test ($MSRV)	2m 42s
build_bin_spec (stable)	1m 6s
build_bin_spec ($MSRV)	2m 24s
no_features_build_test (nightly)	35s
no_features_build_test (beta)	29s
no_features_build_test (stable)	23s
no_features_build_test ($MSRV)	2m 30s
	22m 56s

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